All the mysteries that were unveiled in the third season finale of "The Blacklist" will be explored when the series returns for season 4.

In an interview with Zap2it, series creator Jon Bokenkamp revealed that the upcoming season will pick up where it left off in season 3.

"It's a mess. It's frenetic and dangerous and the stakes are incredibly high," Bokemkamp stated. "Our task force has been fractured in this very strange way and Liz Keen is alive and coming back into the world and there are going to be incredible stories to tell, not only with her and Red but with the rest of the team and how they move forward."

The series creator also revealed that Ulrich Thomsen's character, Alexander Kirk, will return for the upcoming season to reinstate his claims of being Liz's (Megan Boone) father. According to the series creator, Thomsen showed an amazing screen chemistry with Boone and James Spader.

"I think that character and that storyline are going to be, I hope, really surprising and really refreshing for people. I think it's going to be a really great story," Bokenkamp said.

Also, Bokenkamp clarified that Ryan Eggold's character Tom Keen will still be seen in "The Blacklist" despite his participation in the spinoff series "The Blacklist: Redemption," which will premiere as part of NBC's midseason offering. The series creator revealed that the character will still help Liz find their missing child and determine who Alexander Kirk really is. They will also deal with Red's (Spader) betrayal, which is why Tom could still appear on the show for a long while.

Meanwhile, reports also revealed that Lotte Verbeek will reprise her role as Katerina Rostova, Liz's mother, when the series returns for its fourth season.

"The Blacklist" season 4 is scheduled to premiere on Sept. 22 on NBC.